Cheats and
•ZMZIM! K
revealed!
Compute a
fun brew for
EcJlovfii!
For /-U.L. users
of the Electron,
BBC Micro, PC,
Amiga, C64/128,
Archimedes,
Amstrad CPC,
Atari ST and
Spectrum
No 3 October 1990
A Database Publication
10
770960
283003
PRICES GO OFF THE RAILS! PRICES GO OFF THE RAILS!
C3
CO
o
CO
CD
CO
o
CO
s
CO
UJ
o
L***!
• •
^s
u
DISC PRICES GO UP IN SMOKE!
9
o
3.5" DISCS & BOXES
n if 8188 ! H S! 8RH !§S SSSS3 tSSSItl TO! g =||
55 3 5" DS-DD 135 TPI WITH 100 CAPACITY LOCKABLE STORAGE BOX £32.95
65 3 5" DS-DD 35 TP WITH 100 CAPACITY LOCKABLE STORAGE BOX £38.95
75 3 5" DS-DD 135 TPI WITH 100 CAPACITY LOCKABLE STORAGE BOX £42.95
100 3 5" DS-DD 135 TPI WITH 100 CAPACITY LOCKABLE STORAGE BOX £52.95
50 35" DS-DD 135 TPI WITH 100 CAPACITY LOCKABLE STORAGE BOX £72.95
200 3 5" DS-DD 35 TPI WITH 100 CAPACITY LOCKABLE STORAGE BOX £82.95
OUR 3 5" DISCS ARE VERY CAREFULLY SELECTED TO GIVE YOU 100% ERROR
FREE PERFORMANCE. EACH DISC IS OFFERED WITH OUR 100% MONEY BACK
GUARANTEE AND IS SUPPLIED WITH LABELS
5.25" DISCS & BOXES
U & 81:88 fe 7?\ BSH Z g&SH ISSSffi USSJii gg ::::::|i|
50 5 25" DS-DD 96 TPI WITH 100 CAPACITY LOCKABLE STORAGE BOX £24.50
100 525" DS-DD 96 TPI WITH 100 CAPACITY LOCKABLE STORAGE BOX £29.50
200 5 25" DS-DD 96 TPI WITH 100 CAPACITY LOCKABLE STORAGE BOXES ..£52.99
OUR 5.25" DISCS ARE YEB1 CABEEUU1 SELECTED TO GIVE YOU 100% ERROR
FREE PERFORMANCE. EACH DISC IS OFFERED WITH OUR 100% MONEY BACK
GUARANTEE AND IS SUPPLIED WITH LABELS
HIGH DENSITY 3.5" DISCS
10 DS HD 3.5" DISCS IN LIBRARY CASE £14.99
30 DS HD 3.5" DISCS WITH 50 CAPACITY BOX £39.95
50 DS HD 3.5" DISCS WITH 100 CAPACITY BOX £49.95
100 DS HD 3.5" DISCS WITH 100 CAPACITY BOX £89.95
HIGH DENSITY 5.25" DISCS
20 DS HD 1 6 MEG WITH LOCKABLE STORAGE BOX £14.99
50 DS HD 1 6 MEG WITH LOCKABLE STORAGE BOX £27.99
75 DS HD 1 6 MEG WITH LOCKABLE STORAGE BOX £39.99
100 DS HD 1 .6 MEG WITH LOCKABLE STORAGE BOX £47.99
200 DS HD 1.6 MEG WITH 2.100 CAPACITY BOX £89.95
I QW LOW PRICES
FOR BULK BUYERS
For all you large users we have some
unbeatable BULK RATES ON OUR
SUPERB DS-DD 3.5 DISCS
400 DS DD 135 tpi £160.00
500 DS DD 135 tpi £195.00
600 DS DD 188 tpi £229.00
800 DS DD 188 tpi £295.00
1000 DS DD 135 tpi £320.00
AS ALWAYS LIFETIME GUARANTEEED
UNQUESTIONALBLE RELIABILITY. EACH
DISC IS SUPPLIED WITH LABEL.
LOOK
NEW EXCITING PRODUCTS
NEW TecMink Mouse Inc Inage 72 software £29.99
NEW Aero Moum inc. ft Halo £29.99
Both above have Drwr Menu Maters, Mouse Pad fi Pocket
NEW StaduWe Boxes 250 capacity 3.5 only £17.99
NEW Ultra Sliniine V.P.S. Battery Back up systems
(Ptease nng for pnees S speaficaoonst
We also carry Cables, Data Switches,
Disc Drives etc., etc
T
PRICE & QUALITY
GUARANTEE
We pride ourselves on
offering you the very Highest
Quality products at the best
possible prices. If you
should ever see a
comparable product offered
cheaper in this magazine
DO NOT HESITATE give us
a call because we won't
match it.
WE WILL BEAT IT
GUARANTEED
Trade Accounts Welcome
M.D. OFFICE SUPPLIES
1 8 CRESCENT WAY, FARNBOROUGH, KENT BR6 9L$
TELESALES HOTLINE: 0689-61400
All prices include VAT and delivery UK only. E/OE
CD
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cd
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CD
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CD
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CD
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Education Orders Welcome {/J
RAILS
>#
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^
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^
3 GREAT CONTESTS
NEW!
The Games Gang
reveal all the best
cheats and passwords
GOTO CENTRE PAGES i{
WIN the latest
Amiga - and lots
of other prizes
GOTO 9, 17 and 43
Pop Quiz
'<S&
GOTO 26
*^fv
HR wv>
v\W
Get your computer
to mix you a
witches 1 brew
GOTO 6
CO
^>«
^.
Published by Database Publications Ltd, Europa House,
Adlington Park, Macclesfield ST10 SNP
Teh 0625 878888 (All departments) 05 1-357 296 1 (Subscriptions)
Telex: 94031191 Fmx: 0625 879966 MtcroLink: MAG001
Managing Editor Derek Meakin
Features Editor Peter Davidson
Creative Editor Mark Nolan
Ace Cartoonist Mike Goldberg
Production Editor Peter Glover
Ad Manager John Snowden
Ad Sales Yvonne Benson/John Weir
Circulation Exec Carolyn Wood
O 1990 Database Publications Ltd No
material may be reproduced in wtiole or in
part without written permission While
every care is taken, the publishers cannot
be held legally responsible lor any errors
in articles or adven:isements
News trade distribution Comag.
Telephone 0895-444065
Database Publications l» a
division of Europress Ltd
m
Regulars
Final Front Ear
Rom and Ram
Gadget Shop
Safe Scientist
How a Computer Works
Keyboard Kapers
Logo Lowdown
GOTO 8
GOTO 1 1
GOTO 14
GOTO 18
GOTO 20
GOTO 27
GOTO 35
LETS COMPUTE' OQlOOer 1990 3
I have discovered a bug in the
Gingerbread roms program. I
typed it in on my BBC Micro
exactly as it is shown.
But I received the error
message: Mistake at line 260.
When I examined that line I
discovered that the command IF
had been left out.
The corrected line is:
IF r<1 THEN PRINT ;"Three
quarters";:R£TURN
- Matthew Thompson (16).
Kidlington, Oxford.
We're sorry the word was
missed. The listings are
all well checked before
printing but we missed
that one.
We're stepping up up
our testing to ensure it
doesn't happen again.
you have any tips for other readers, send
them in. If you have any questions about
your computer or software just ask us. We'll
try to answer them on the Noticeboard.
Let us know what you want to see in future
. And if we use your letter or ideas
we'll send you a Let's Compute!
baseball hat!
Send your letters to Let's
Compute! Europa House, Adlington
Park, Macclesfield SK10 4NP.
^"^ Remember to tell us your age.
The second issue of Let's Compute! was great. Even better than
the first. And that's high praise indeed!
I like the electronic game in The Gadget Shop. We had one at
our summer fair, and there's one at the Science Museum in
London. I can do all three of them.
The pictures in Al's Gorithms are really sweet. It's amazing what
you can do with circles.
The Back to the Future program is really useful. I always want to
know what day things are on. whether I've got a piano lesson on
my birthday and so on.
The program now does it for me. I don't need to look at the
calendar any more.
And what about the football bit? It is probably interesting if
you're interested in football. But I'm not.
Finally, I think the competitions are great. Let's have even more!
- Kathryn Price (12). Alfreton, Derbyshire.
Winners! Winners! Winners!
Winners! Winners! Winners!
Hundreds of you wanted to personalise your computers
with cute Computer Critters. But we only had four to give
away and they're winging their way to the winners of the
contest we printed In the August Lot's Compute!
Congratulations to these lucky winners: Miriam (8) from
Chigwell in Essex, Steaphnie Leack (11) from Lancaster,
Jamie Radford (14) from Uplands near Swansea and
Jason Cooke (10) from Bromsgrove.
Hard luck losers. But we've even more prizes to give
away in this issue of Lot's Computet So see if you can win
one of those.
Entries for the
Alphabet Artist
contest are still
pouring in. But
there's still time
for you to send
yours before
November 30.
The picture of
Churchill shown here is by Martin
Pegg (13) from Derby. He's just one
of this month's five lucky winners
who'll be receiving a copy of Art
Studio from Impact Software.
This month's other four winners
are:
John Pearce (15) from Knaphill,
Surrey - a Spitfire
Owen Williams (12), Haistead,
Essex - a helicopter
Richard Gubbing (10), Congleton,
Cheshire - Fat puss the cat
Gemma Hillman (7), Loughborough.
Leics - a dog
Don't forget, there are lots more
prizes to give away: A voucher
worth £50 for the overall winner to
spend as you wish and TWENTY
more vouchers worth £5 each for the
next 20 best.
Impact are also presenting £100
for the best picture received with a
school name on the entry form.
You'll find entry forms in the August
and September issues.
B6HBWVWBBVBV
(ejwjpejWvVQVvvvwwi
4 LETS COMPUTE' October 1990
Many congratulations on what would appear to be an excellent computer
magazine for children! It's full of ideas for learning about IT that can be
easily transferred to classroom situations.
Would it be possible for us .to photocopy some of the material for use in
school? Perhaps we could provide you with some field research in return.
I was also wondering if you did any special promotions for schools I feel
that your magazine is one that we could promote in school to the benefit of
our own pupils.
- Arnold Marchant, Boldmere Middle School
We've received many letters like this from schools wanting to
boost their funds. As always, LeVe Compute! does what its
readers want.
So, we'll give £1 for each subscription a school gets for Let'*
Compute! For more details, write to Pete Davidson.
All the material in Let s Compute! is copyright and must not
be reproduced without written permission. Any school
obtaining more than 10 subscriptions will automatically be
given this permission.
Thanks for the offer of field research. We value feedback
from all sources. It's only by hearing what children and schools
want to sea that we can give you exactly what you want.
I have just had an idea for your comic: A high score table for games
would be great!
You could ask readers to send in their name, address, computer
and the high scores they're reached . Then you could print them. It
would give Let's Compute! readers something to compete against.
- James Holiis (13), Wakefield, W. Yorks
We'll be printing our first high score table next month. If
you would like to see your name on lt v just fill in and
send us the coupon below. Post it to High Scores, Let's
Compute! Europa house, Adlington Park, Macclesfield
SK10 4NP.
We'll print the best. By the way, James. You didnt give
us your full address. Remember that ALL writers of
letters on the notlceboard receive a free baseball hat.
Your hat's here waiting: Just send us your address.
i- — — — — — — — — — — — — — _ _ __________
High score challenge
a
m
Name
***** * . •
Address
I am a Let's Compute! Club
member and want to take part in
the competitions. But I don't want to
cut up my copy of the comic.
Can I photocopy or draw the
entry form myself?
I find Let's Compute! easy to
understand. There's only one word
for it -BRILLIANT!
- Laura Corney (13), Greenock,
Scotland
We don't mind how your
entries are sent. But try to
keep them about the same
size as the ones we print. And
make sure you tell us
everything that's asked for on
the original coupon.
If you want to enter more
than one competition you can
send them all in one envelope.
Just address it to Let'e
Compute! Competitions!
Europa House, Adlington Park,
Macclesfield, SK10 4NP.
I have just received my member's pack. I
am very pleased with it, especially the
software.
However, I looked at Ihe ruler and
decided to memorise which was Ram and
which was Rom. On the ruler Rom wears
the glasses, but in the first issue of Let's
Compute! Ram has the spectacles.
Could you please tell me which is which?
- Simon Marwood ( 12), Richmond,
North Yorks.
Ram is the clever one with the
glasses. Rom is rather thick, and
always hungry. The cartoons are
drawn by ace cartoonist Mike
Goldberg and are therefore always
right in the magazine. But when
they were put on the ruler,
someone got it wrong.
Mike sent a special cartoon to
the person who made the mistake.
We're printing it here to help any
readers who are at all confused
between Rom and Ram.
tfW
r-iyee.
Age
Computer
Game Score ...
Game Score ...
Game Score ...
IjGame Score ...
A
Vie party season has
arrived. And what
better way to make a
m
veen party
yomr-fioww
fizz than to prepare
an wmual cocfaail
of firm fa?
Here's a program that
gives you a few ideas of
what you could mix with
what.
But once you've created
your tasty concoction,
what do you call it?
The program itself
comes to your rescue.
Along with the list of
suggested ingredients you
also get a name.
As it's one made up by
your computer it may look
strange. And you may
have trouble saying it. So
be warned: With some of
them you may tie your
tongue in knots trying!
Now type it in - and have
fun!
6 LETS COMPUTE' October 1990
H,
Of
kaa
MtfL
?
ie
w
aPob
k'ce
How to make a Zuno
2 Measures of Apricot juice
3 Measures of Pear juice
2 Measures of Bitter Lemon
1 Measure of Soda Water
add some lime peel
add some dried peaches
add some fresh pineapple cubes v$S?-
•*«
Is YOUR machine here?
n*
10 REN The Witches' Brew
T "h";
20 (tEn (C) Let's Coipute!
450 GOSUB 580
30 DEF FNr(n)=RND(n)
460 PRINT vS; .
40 LET ul="aeiou"
470 IF FNr(15)<2 THEN GOTO 450
50 LET v$=""
480 LET R=FNr(21):PRlNT AID$<c$,R,1);
60 LET c$="bcdfghjklipqrstv*xyzn"
490 IF FNr(15)=1 THEN PRINT NIDS(c$,R,
70 DIM dl(3,50):DIN x<3)
1);
80 FOR A=1 TO 3:LET N=0
500 IF R=12 THEN LET v$="u":PRINT v$;
90 LET MH*1
510 IF R=1 THEN IF FNr(20)=1 THEN PRIN
100 READ dS(A / H>
t V;
110 IF d*(A, «)<>"" THEN 60T0 90
520 IF R=2 THEN IF FNr(2)=1 THEN PRINT
120 LET x(A)=N-1:NEXT A
"k";
130 LET DUNHY ■ RND(-TIBE)
530 IF R=15 THEN IF FNr(9)=1 THEN PRIN
U0 CLS
T "h";
150 PRINT "WITCHES' BREW"
540 IF R<>12 THEN IF FNr(15)=1 THEN PR
160 PRINT
INT "r";
170 PRINT "Ho* to lake i ■;
550 If FNr(5)<4 THEN 60T0 450
180 GOSUB 400
560 IF FNr(9)<5 THEN GOSUB 58*: PRINT v
190 PRINT
$;:IF FNr(15)=1 THEN PRINT "r";
200 FOR C=1 TO 3
570 PRINT: RETURN
210 GOSUB 270
580 REN FIND A VOWEL
219 NEXT C
590 LET xS=v$
230 PRINT
600 LET P=FNr(5>
240 PRINT "Press a key for i
mother drl
610 LET vSMID$(mS,P,1)
fl
620 IF vS=xS THEN 60T0 600
250 LET AI ■ GET
630 RETURN
260 GOTO 140
640 REN Soft Drinks
270 REN SORT OUT WORDS
650 DATA "Leion juice", "Apple juice"/
280 LET LD=0
Pineapple juice'/Toiato juice"
290 LET T=FNr(3)
660 DATA "Apricot juice", "Orange juice
300 LET R=x(C)-LD
", "Nixed fruit juice", "Liie juice"
310 LET D=ABSCFNr(R+2)-FNr(R))+1+LD
670 DATA "Vlaito cordial", "Pear juice",
320 IF 0>x(C) THEN GOTO 390
680 REN Fizzy drinks
330 IF C=3 THEN PRINT "and soie ";:60T
690 DATA "Coke"/V1ito"/7 Up"/Leiona
370
de", "Bitter Leion", "Tonic Mater"
340 PRINT " ";T;" Measure";
700 DATA "Ginger ale", "Soda water"/"
350 IF T>1 THEN PRINT "s of
■ >
710 REN Floaters
360 IF T=1 THEN PRINT ■ of
720 DATA "orange peel M /ice cubes"/cl
370 PRINT dt(C,D)
oves","leion peel"/liie peel"
380 LET LD=D:G0T0 290
730 DATA "cherries'/crushed ice"/app
390 RETURN
le slices"/raisins"/dried apricots"
400 RER FIND AND PRINT NANE
740 DATA "dried peaches"/fresh pineap
410 LET R=FNr(21)
pie cubes"/orange slices"
420 PRINT CHRS<ASC(NID$(c$,li
!,1))-32>;
750 DATA "
430 IF R=12 THEN LET vS="u":
PRINT v$;
440 IF R=15 THEN IF FNr(5)=1
THEN PRIN
BBCMicro/Archimedes/Electron
The listing works as shown
Am s trade PC I Spectrum
Change the following lines:
30 DEF FNr(n)=INT(RND*n*1)
130 RANDOMIZE TINE
250 WHILE INKEY$="":WEND
C64/128
Enter the program in capitals.
Change the following lines:
30 DEF FNR(N)=INT(RND(0)*Nt1)
140 PRINT CHRSC147)
250 6ET AS:IFAS="" THEN GOTO 250
420 PRINT NID$(CS,R,1)
Use 48k mode.
Change the following lines:
30 DEF FNr(n)=INT(RND*n*1)
70 DIN d$(3,50,22>; DIN x(3): DIN sS(22)
110 IF dS(A,H)o""sS THEN GOTO 90
130 RANDOMIZE
250 PAUSE
310 LET D=ABS (FN r(R+2)-FN r(R))*WLD
420 PRINT CHRS (CODE (c$(R))-32);
490 IF FN r(15)=1 THEN PRINT c$(R);
610 LET vl=«$<P)
STstos, /Amiga
(Amos)
PC
(GW-Basic)
Change the following lines:
30 DEF FNr(n)=INT(RND*n+1)
130 RANDONIZE TIMER
250 WHILE INKETS= NH :WEND
Change the following lines:
30 HODE0:HIDE
130 LET a=RND(TIHER)
250 WAIT KEY
290 LET t=RND(2)*1
310 LET D=ABS(RND(R*2)-RND(R))+1HD
600 LET p=RND(4)+1
AMOS: Use CLS Instead of NODE0
LETS COMPUTE! October t990 7
FIRST THE LEFT £AfZ , them -rue k/qht ***. **/f> M>tV
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HQCrHoNiA
YOU could be one of the first people to own the
very latest sensation from Commodore - the top
selling Amiga 500 with an EXTRA 512k memory
booster.
That turns it into powerful 1Mb machine. It will
introduce the wonders of the Amiga to many
thousands of new users during the next few
months.
For the package, Class of the 90's - First Steps -
comes complete with a host of valuable extras:
• ProWrite 2.5 - a word-
processor that includes colour
and graphics to let you to
design you own pages
• O-Paint II- a creative paint
package
• O-Print - a design program
for you to make your own
greetings cards and posters
• InfoFile - a database
where you can store information
and pictures
• MusicMouse - start learning
to make wonderful music
• Logo - your very own version
• Talking Turtle - you can
program your Amiga whatever
age you are
• Let's Spell at Home -
helps you to spell by using
pictures
• BBC Emulator - use it to
run the BBC Micro versions of
programs in Let's Compute!
WHAT TO DO
We are looking for the person who can make
the most words out of the letters in these two:
COMMODORE AMIGA
Write down all the words you find on a
separate piece of paper. Then attach it to the
entry form and send it to Let's Compute!
before October 31.
AMIGA CONTEST ENTRY FORM
I found words
PLUS
• A video to teach you how to set up your new Amiga,
use the programs and what to do next
The monitor m the picture « not included m the prize The computer wtfl wort wfff> an ordinary television
1
Name
Address
Postcode
Tel
Age
My present computer is a
i
I
Now send this to: Commodore Competition, Let's Compute!'
Europa House. Adlington Park. Macclesfield SK10 4NP.
LETS COMPUTE' October 1990 9
BBC & ELECTRON
TTTLE BBC Of BBC CPCT
Electron tape disc disc
A Question ot Sport 195 10.50 14.95
Arcade Soccer 9.95 12.95
E-Type 9.95 14.95
Elite 8 95 10.50 15.95
Exile 8.95 10.50 15.95
Hostages 7.95 9.95 11.95
Mo*ed Om 12.95 14.95
Wax {B8C only) 7.95 11.95
last Nm»a 2 7.95 9.95 11.95
Perplexity 7.95 9.95 11.95
Pipemania 7.95 11.95 11.95
Predator 6.95 8.95 10.50
Repton Infinity 8.95 10.50 15.95
Superior Soccer 7.95 9.95 1195
Sporting Tnangto* 7.95 9.95
Tanh Attack 8.95 11.95
Ricochet 6.95 8.95 10.50
Ptay It Again Sam Compilations 1 to 10 (each):
6.95 8.95 10.50
Play ii Again Sam Compilations 11 to 13 (each):
7.95 9.95 11.95
Superior Coll (BBC only) 6 95 8.95 10.50
Superior CcJ2(BBC only) 6.95 8.95 10.50
Superior CcJ3(Ele only) 6.95
Call or wnte to ask for a full catalogue
stating which computer you have - its FREE!
JOYSTICKS
For the BBC. 0+, Master 128 & Electron Plus 1
Competition Pro (15 pin) £19.95
Arcade quality micro switches, 8 directional
control, 2 fire buttons on base.
Superpro Auto (15 pin) E13.95
Arcade quality micro switches, 8 directional
control, triple action auto-fire and suction pads.
Delta 3B Twins £19.95
2 analogue, light spring action.wired to one plug
Delta 3B Single £13.95
Analogue, light spring action joystick. Can be
used as either left or right-handed.
Harrier £4.95
Fire button on control handle, push bar fire and
suction pads
Delta Cat (For Archimedes) £26.95
Or mouse eliminator. Light spring action. Will
operate mouse-driven software such as Zarch.
Quickshot II Turbo (9 pin Atari type) £1 2.95
Competition Pro (9 pin Atari type) £19.95
Mercury Games
Software for the BBC Micro,
Electron, Master Compact,
Archimedes, IBM compati-
bles and 16 bit machines!
V*
BBC/Electron tape SRP £9.95
BBC 5.25" disc SRP £12.95
Archimedes disc SRP £19.95
Atari ST SRP £19.95
Amiga SRP £19.95
(Ait prices tre p*r age
Offer price £7.95 I
Offer price £9.95
Offer price £15.95
Offer price £15.95
Offer price £15.95
ring*)
Iscftool v3
BBC/Electron tape SRP £12.99 Offer price £9.95
BBC 5.25" disc SRP £16.95 Offer price £14.95
(Due tor release November 1990)
Archimedes disc SRP £24.95 Offer price £19.95
(Due for release December 1990)
Atari ST SRP £24.95 Offer price £19.95
Amiga SRP £24.95 Offer price £19.95
(All price* ere per age range: advance order* taken)
AMIGA I ATARI ST
Amos The Games
Creator £34.95
Amiga Mouse £29.95
Kind Words V2 £39.95
Protext £79.95
Dust covers:
AmigalOO £9.95
Amiga 500 £3.95
Atari ST
Mouse £29.95
Disk Doctor £15.95
1 st Word
Plus £59.95
Habamerge £29.95
K Graph III £39.95
Logistrix £89.95
Full catalogues now available for BBC, Master Compact,
Electron, Archimedes and IBM compatible computers.
Please state which machine you have. Great discounts guaranteed!
DETAILS OF ALL NEW RELEASES FOR CHRISTMAS!
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a -I
STOP THIEF III
Gadget Shop proprietor
Mike Cook shows how
his computer is
linked to the
outside world -
to keep out
unwanted
visitors
■U
vr
- -■
*
a
The program and computer terms used in this
article relate to Acom micro*. Readers wtth
an Amstrad CPC, Commodore 64; 1 28, Spectrum,
Atari ST or Amiga who order a Gadget Shop pack
will be sent complete instructions appropriate
to their machines.
There are lots of
ways of making burglar alarms. In the
Gadget Shop this month we'll see how to
turn your computer into an electronic
watchdog.
And you needn't stop at burglar
alarms. The switches we're going to use
can just as easily perform other jobs.
Such as keeping a check on the position
of a model train. Or as the keyboard of a musical instrument.
The link to your computer is through a connector strip. Remember
we made one at the start of this series. Let's see what else we will
Using this type of connector our computer can only detect If
something Is switched on or off. What we have to do is to get our
intruder to do this with some form of invisible switch.
A reed switch Is ideal. It uses two contacts sealed In a glass
envelope. When we bring a magnet close to it the contacts move
together and complete the circuit.
All we need do is mount a magnet on a door and a reed switch on the
door frame. These must be placed so that when the door is closed the
magnet is next to the switch. The magnet pulls the two contacts
together and the switch is ON.
When the door is opened the magnet moves away and the reed
switch opens. Our computer will spot this happening and raise the
alarm.
If you are connecting your alarm to the User Port of an Acorn
machine you have eight inputs and can monitor up to eight doors or
windows at the same time. If you connect it to the joystick port of
another micro you have five inputs.
In fact you can alarm any number of doors or windows by Just
chaining the switches together. In this way you'll know when one Is
open. But not which one. J
Other uses for the switches
If you want to monitor the position of a model train put the reed switch
near the track and the magnet on the train. The switch will close as
the train passes over it.
Or you can make a simple musical instrument by mounting eight
switches in a row. If you connect them to your micro and write a short
program you can play tunes by waving a magnet over the switches.
There are lots more uses for this type of switch. For example you
could design an electronic game.
Let us know if you make anything unusual from these
switches - there will be a prize for the brightest idea.
IN THE SHOP SOON: UNIQUE ELECTRONIC GAMES
Which switch do you need?
On offer this month are three different
types of reed switch and magnet. They're
all mounted in white PVC cases and fixed
in place with screws or nails.
The surface mounting set can be used
for windows as well as doors. The two
recessed sets - one large and one small
- are best tor doors. The diagram shows
how to wire them up and the photographs
show them fitted.
You can connect several different
switches to one computer. Just copy the
wiring diagram fpr each one.
Any unused inputs should be
wired directly to the earth
connection •
The listing given is for a BBC Micro. It
is a simple program to monitor the
switches and raise the alarm. You can
use it as a basis for your own routines.
Remember to make the modifications
shown below if you are using an Electron
or Archimedes.
Modifications for the Spectrum. CPC,
Atari ST and Amiga are supplied with
Gadget Shop Pack 2 - remember to state
which computer you are using.
WARNING
Keep the magnets
in the contact
sets away from
your discs.
Magnetic fields
can damage
programs stored
on them.
Alarming a door on Pin and two on Pin
10 HODE 7
20 PftlNT"The Gadget Shop Intruder AU
n'
30 REPEAT
40 CZ=1
50 PRINT TABU, 4)
60 At=?lFE6«
70 fOR b:=« TO 7
80 IF (CI AND AX)=0 THEN PRINT'Locatl
on ";BZ;" is s«fe';$PC<1l) ELSE PRINT"In
truder at Location ";BZ
90 U*CP2
100 NEXT Bl
110 If Ai<>0 THEN SOUND 1,-15,20,1:500
ND 1,-15,101,1
126 UNTIL FALSE
BBC listing - see text tor other computers
The three types of contact you can get from The Gadget Shop
^
IS THIS YOUR COMPUTER?
BBC Micro: Use the program above.
Archimedes and BBC A3000: You
need an i/o podule. The program also
needs to be changed.
Replace Line 60 with:
SYS "OS Byte", 151, (60 TO ,,AZ
Note that the two commas after the TO
are essential.
Electron You need a Plus One and
User Port expansion - available from
Pres (0276 72046). The game and
program work as they are described
above except that the memory location
which is accessed by the User Port is
&FCB0. So wherever you see &FE60 in
the program you use &FCB0
t
Spectrum: You need an Interface 1
and the gadget connects to the joystick
port*.
Amatrad CPC, Commodore
64/126, Amiga and ST: The gadget
connects to the joystick port*.
* The full assembly instructions are in
Gadget Shop Pack 2 The short Basic
routine to operate the gadget will be
supplied when you order it.
V
mm
'mm
Make a gadget that
tests how good you
are at shaking a
sauce bottle!
Why ever should
you want to do that?
Well it could turn
out to be a super
electronic game!
Find out what it s
all about in Let's
Compute! next month.
ORDER FORM
Pack 2 - Reed switch sets
This contains all the bits you need to
make your burglar alarm except for
the connector cable. This is still
available, and you can also use this
order form to get one.
□ Surface mounting reed switch
plus resistor £2.60
Recessed round type plus
resistor £2.70
Recessed square type plus
resistor £2 60
You'll also need Pack 1 - the
User Port connector ceble:
□ 20 way IDC plug, length of 20
way ribbon cable. 12 way chock
block, cardboard base. 2 foam
sticky pads PLUS 2 spare
connectors and a resistor £1.99
□ As above but with IDC plug
ready connected ...£2.49
□ As above but with connector for
Master Compact in place of IDC
plug ...£3 99
□ As above but with connector for
joystick port of Spectrum,
Amstrad CPC .Commodore
64/128. ST or Amiga in place of
IDC plug Basic program and
instructions will also be supplied
.. £399
Please state your type of computer.
Educational establishment orders
accepted
c * Make cheque* payable to
Musbury Consultants and
send to: Musbury Consult'
ents, 8 Fairhill, Helmshore,
Rossendale, Lanes BB4 4JX
Name
:.'
Address
Post code
> AUTO MONEY BOX e WEATHER STATIONS
LETS COMPUTE.' Cciober 1990 U
This Is the original program:
I
*
There's always a better
way of doing things, and
here's another program just
waiting to be operated on.
Our resident micro medic
diagnoses several
shortfalls.
II PRINT "This is all the program does.
21 PRINT "Do you Mint to finish?(Y/N>"
31 k$=6ETS
if IF k$o"Y" THEN RUN
How the Doc altered it:
1 REM Iff Program Doctor III
2 REA 9U Version Two »tl
II PRINT "This is all the prograi does
21 PRINT "Do you want to f ini sh?< Y/M>"
31 k$=GET$
41 IF k$o-Y- OR k$o"y" THEN RUN
SI PRINT "Goodbye then"
IS YOUR .MACHINE HERE?
Electron/BBC/Archimedes
The programs work as shown
CPC/PC (GW-Basic)
Replace k$=GET$ with.
K$="": WHILE K$="-:KS=INKEr$:MEND
Commodore 64/128
Enter the program in capitals
Replace fcl*6ETS with:
SET K$:1F KS*" THEN 40T0 30
Spectrum
Select 48k mode
Replace ks=6ET» with:
«=INKEYJ:IF W»" THEN 60T0 30
Amiga and Atari ST
Use Amos or Stos
Replacement withkU\H?\ju\)
\
►member all those games
rograms where, having
lost all your lives all too
ckly, the micro offers
ou a chance to play the
? Well, that's what the
gram at the top of the page does. It
prints out a simple message until you press N to finish.
Recognise the standard question:
Oo you want to finish?{Y N)
Actually all that happens is that line 40 tests wether Y
was pressed. If it wasn't it RUNs the program again. If
you pressed any other key - including a small y - the
program ends.
But we can do a much better job. The second program
shows how.
Here are improvements that have been made:
• You should always test for lower case letters as well
as capitals - y as well as Y. That's what the OR is doing in
the new Line 40.
• It's also polite to let the user know that the program
has ended. So Line 50 is there to round things off.
Those are the programming changes. But you might
notice something else - put in to make the program
easier to read.
It now starts with two lines of REMs. These don't affect
the way it runs, but they act as a useful signpost. They
tell you things like which version of the program it is and
so on. Still, things could be even better. At the moment,
any key except Y or y will repeat the program, despite the
fact we've asked for a yes or no answer { Y/N).
There is one way round this. Just add another IF ...
THEN. Put in the following line and you've got a much
more friendly program:
45 ! f UoT OR kS<>V THEN SOTO 31
All right, the main part of the program does nothing
except print a bit of text. But the point is that WHATEVER
someone types it is dealt with properly now.
The program caters for every input so there can be no
freak happenings when someone presses X, say. And
that's what makes a more polished job.
These routines will work - with the small changes
listed - on most home micros. But there are more elegant
ways of doing the same thing.
The snag is that you need to use different commands
for different micros.
For example, on the BBC Micro you can use the
command INSTR as part of your check for which letter
was pressed.
On Page 9 of the August issue of Let's Compute! the
green part of the listing shows this.
If you can write a super sophisticated bit of program to
check for a Y/N reply on your micro, let us see it.
We'll pin the best to the Noticeboard aw*
73*mi>
H C
Software
giants
US Gold and
Ocean have
got together
this month to
offer a deluge
of goodies.
And they're
ONLY for readers
of Let's Compute!
There ai
185 prizes
to be won in
this great
prize bonanza:
Pens*
Badges •
T Shirts *
Balloons *
Keyholders *
Baseball caps *
PLUS, for those
winners who
have a CPC, C64,
Atari ST, Amiga or
r Spectrum, there
are 10 copies of Ocean's
superb Midnight Resistance
ENTRY FORM
■
Questions *;« vv :v >
1 Kylie first appeared in which TV
soap?
a Home and Away
b The Young Doctors
c Neighbours
2 Which country saw the first kites?
a China
b USA
c France
3 From which tree do we get conkers?
a Horse Chestnut
b Oak
c Yew
4 Which building did Guy Fawks try to
blow up?
a Buckingham Palace
b The Houses of Parliament
c 10 Downing Street
My answers
Name
.□ ,□ ,□ .□
Address
Postcode
I
I
I
I
x
My computer is a
Send to
Bonanza Competition. Let's Compute!, Europa House.
Adlington Park, Macclesfield SK10 4NP
Age
This month's program is all about the
scientific way off using pressure to do Bn
everyday job. The program examines how the
kind of jack used in garages for lifting up cars
works.
It's really just a couple of cylinders Joined
together by a narrow pipe.
Each cylinder has a well-fitting piston
inside it and the whole thing is filled with
fluid - usually oil. So if you push down on one
piston the oil passes the pressure produced
on to the other cylinder, which moves up .
The clever part of the whole arrangement is
that you can lift big weights easily if you
choose the right size for your cylinders.
In the program you can change the size of
either cylinder and see what happens. You
can also alter the weight of the car you lift -
scientifically known as the load - and how
hard you push - the effort.
You may notice that units aren't mentioned
in the program. They could be anything but, if
you prefer, just think that lengths are in
centimetres and forces and weights are in
newtons.
The program works well, but has been kept
as short as posible. If you are a programmer
you could enhance It yourself.
For example, there's a procedure called
PROCtap that checks for you pressing the
spacebar. It was given that name because it
was going to draw a tap in the pipe between
the two cylinders - the tap would open when
the spacebar was pressed.
PROCtap was shortened to reduce the
length of the listing, but you could write your
own.
You could also give the pipe a more unusual
shape - machines like this will work even if
knots are tied in the pipes. Also sound could
be added.
Alter the program to suit yourself and use it
in any way you like.
Just remember one thing. Science is meant
to be fun, so start experimenting.
16 LETS COMPUTE! October 1990
21 REN By the Site Scientist
31 UN (c) Let's Coipute!
4f «QDE6:YHJl9,M;|;:M0Cinstruct
51 •FIH,!
61 BZ=8l2l2IA:PIQCsetup:REPEAT
71 PtQCsetup:REPEAT:N0DE6
II R0DE6:VDU23;82I2;M;M;
91 lh:=5M:ehZ=5M:PROCaltervirs
111 PR0CaLtervars:NQDE1
111 «0«1:V0U23;82I2;I;I;I;I;
121 PR0Cdra*press:PR0Cload(1)
131 PROCtap:PROC«oriout:UNTIU:END
141 OEFPROCsetup
151 U=1MI:eZ=5M:UZ=2U:elX=1M
161 LhZ=5M;ehX=5M
171 VDU23,224,3, 4,8,63,127,255, 255,48
181 VDU23,225,24|,136,132,254,127,127,
255,12
191 carl=CHR$224KHRS225
211 VDU23,226,l,f,M,24,24,24,24
211 VMI23,227,24, 24,24,24,255, 126,61,2
4
221 arS=CNRS226+CHRS8*CtiRS1ftCHRS227
231 DEFPR0CdriMpress:GC0Ll,1
241 N0VE2M,2H:MAV1»I,2M
251 R0VE2M,2lf:DRAU2ll,7ll
261 R0VE1MI,2«l:DMHlfH,7M
271 NQVE2IMlZ,3ll:MAtMIM-elZ,3M
281 R0VE2lltllZ,3H:DUU2fMtZ,7H
291 H0VE1MI-elZ,3H:»A«1HI-elZ,7«
311 6C0LI,2
311 N0VE2»4,UX:DRAlM96*UZ,lnZ
321 H0VE1H4-eLZ,5ll:DRAV996,5H
331 ENDPROC
341 DEFPSOCtoad(cZ)
351 (C0LI,cZ:VDU5
361 N0VEl68*UZ/2,lhZ*36:PRUTcar$
371 N0VE984-elZ/2,ehX«76:PRUTar$
381 VDU4:ENDPR0C
391 DEFPROCtap
411 PRHmAB(4,3l);"Press Spice to see
what happens"
411 REPEATUNTIL1NKY-99
421 PRINTT*B(4,3l);SPC<31)
431 ENDPROC
441 KFPIOCMorkout
458 »H15,I
461 H=PPUlZ/2)*2:ea=PI«(tlZ/2)*2
471 lp=tZ/la:ep=eZ/ea:st-lp-ep
481 IF st<MH1 AND st>-MH1 Iff
491 IFst>l NZ=-1 ELSE IF st=l NZ=I ELS
E «=1
5H ei=la/ea«NI
511 PRINTTAB(4,1)-LOAO-TAB(3l,1)"EFF0R
V
521 PRINTTAB(17,3) tl UEUNT M TAB(12,S)"ri
5T0N DIAREUfTABtH^J-PISTOR AREA"
531 PRINTTAB(4,3>;lZTA8(3«,3>;eZ
541 PIUTTAB(4 / 5);UlTAB(3l / 5);elX
551 PRUTTAB(4,7);Li TAB(3l,7);e*
561 REPEAT:PROCloid(|)
571 lhZ=lM*RZ:eh:=eh:-ei
581 PR0CLoid(1):GC0Ll,2
591 H0VE2l4,lhZ:DRAlM96*llZ,UZ
611 H0VE996,ehZ:DRAll1H4-eLZ,ehZ
611 6C0LI,!
621 H0VE2l4 # LhMlZ:m«196Mi: / lh:-li:
631 NQVE996,ehZ»ei:DRAyiM4-ei:,ehZtei
6M UNTIL ehZ>7« OR ehZ<3H OR lhZ<30
OR rim
65t GCOll,2:flOVE2f4,LhZ:DIIAV196*UZ,lh
Z
661 R0VE996,ehZ:DRA¥lM4-elZ,ehZ
671 IF RZ=-tP«lNTTA8(2,27)-The car Is
too heavy for the effort,"
681 IF HZ=1PRINTTAB(2,27>-Tlit effort h
as lifted the car.'
691 IF «=iPRIHTTAB(H,27)-BALA«ED!'
711 PRINTTAB(2,3l)"Pre$$ Space to cont
Inue."
711 REPEATURTUimr-99
721 ENDPROC
731 DEFPROCinstruet
741 PRHTTAB(12,1)-A HYDRAULIC JACK"TA
B(t2,2>
751 PRINT"-A hydraulic jack is used t
o lift a car, ""The jack has two cylinde
rs which are" '"linked. Inside each cylin
der there""is a piston. The car rests o
n one""piston. Effort is used to push o
n""the other."
761 PRIHT'-Tou can alter the sue of e
ach piston'*'and cylinder, the weight of
the car" ' "and how hard you push."
771 PRIHT'-Soaetiies, all of the force
< will""bilince and the car won't love
up or""down. Try to find out why this h
appens."
781 PRINTTAB(2,22)'Press Space to star
t"
791 REPEATURtTILlNKET-99
811 ENDPROC
811 DEFPROCaltervars
821 ^115,1
831 PRINTTABdl^KCHANGE THE VARIABLE
S"TAB(1I,4)
841 PRINTTAB(2,6)"ieight of cir"TAB<2,
8)"Effort-TAB(2,l»)'Diaieter of load pis
torTTA8<2,12)*Dii«ter of effort piston"
851 PRINTTAB<2,22>"Preis Return when r
eady"
861 PRINTTAB(2,18)"Press Space to sele
ct"
871 PRINTTAB(2 / 2l)"Press < or > to cha
nge*
881 15=6
891 REPEAT
911 PRINTTAB(3l,6);lZTAB(3l,8);eZTAB<3
l,1l);llZTABl3l,l2);elZ
911 IF INKET-99 1I=XI+2:IF XZ>12 HM
921 IF IZ=6 AND IRKEY-1R3 AND IZ>1M I
Z=IZ-1II
931 IF XZ=6 AND UKET-114 AND IZ<5IM
IWMM
941 IF XZ=8 AND IRKET-1R3 AND eZ>1M I
MMffl
951 IF XZM AND INKET-1I4 AND eZ<5fll
eZ=eZ*1ll
961 IF lZ=1l AND INCET-113 AND UZ>8l
UZ=UZ-1I
971 IF 11=11 AND INKET-1I4AND HZ<3lf
IU=UZ*1I
981 IF U=12 AND INKET-113 AND elZ>5l
elZ=elZ-1l
991 IF IZ=T2 AND IHUMI4 AND elZ<3ll
llX*tlMI
1MI PRINTTAB(3I / H);SPC(9)
1111 TIRE=I:REPEATUNTILTINE>5
1121 UNTILINKET(I)=13
1131 ENDPROC
National Cu
Attainment
urn
Its covered
This program covers loads of thos<
science attainment targets that all young
scientists are working towards on the
National Curriculum:
Target
Title
Levels 1
AT1
Exploration of Science
2.3.4.5,6 and 7 I
AT10
Forces
2,3 and particularly 6 1
AT13
Energy
3 and particularly 6 1
AT17
The Nature of Science
5 1
See If you can find
how to balance
the system so that
the car goes
neither up nor
down. Don't just
find one case
see if you can find
a pattern in what
happens.
If you do well
you should be able
to say what the
result will be no
matter what
weights and sizes
are involved.
Incidentally, it's
a good idea to
work with a friend
so that you can
talk over your
theories and swap
ideas.
19 LETS COMPUTE! October 1
Part 2
The brain of a computer is called the CPU - which stands for Central
Processing Unit. But before it can start working things out for us we
need to put some facts and figures into it.
So this month let's look at how information gets from the outside
world into our minature electronic world. This is usually done using a
keyboard.
The technical term for what you feed into a computer is data. And the
keyboard is only one of many things we can use.
It can be done in many other ways.
You may have a mouse or a joystick. When you're using them you're
also feeding information into the computer - just as when you're using
a keyboard. They're all input devices.
You can use a connector called a Midi interface to link a musical
instrument to your computer. The instrument is then an input device for
the computer.
And there are still more - tracker balls, light pens and scanners.
They all have one thing in common: They take information and turn it
into electrical signals which represent numbers.
On the very first computers the only way to feed data in was through
a row of switches. Turning them on and off in certain patterns sent
information to the CPU. Now computers are much easier to use. They
are said to be more user friendly.
But if you think the old idea of switches has been replaced by the
keyboard think again. For this is still only a lot of switches - pressing a
key just turns on a few at a time.
A keyboard is a rather slow way of getting data into your computer.
It's much faster if you use a a tape recorder or disc drive.
These take data that has been stored as a magnetic pattern and
change it into electrical pulses.
The CPU can read these pulses and carries out the coded
instructions that they make up. Whether it's just a single letter or a
complete game, the data reaches the CPU in pulses.
What it does with them will be revealed in the next
month's Let's Compute*.
\
Keyboard
Pressing a key sends a
coded number to the
CPU. For example,
W the letter A is
sent as the
number
65. Each
key has a
different
number - called
it's Ascii code -
between and 25S.
Joystick
Most joysticks
contain five
switches
one for each
direction and
one for fire.
Whenever a switch
is activated it sends ^
number to the CPU.
Diagonal movements are detected if the
numbers add up to the same as two single
movements.
20 LETS COMPUTE' October 1990
■SSI
■
s
BINARY BITS
We count in Tens and Units. It
works well - we can use our
fingers (and thumbs) to count
on.
But a computer works with
switches and electrical
pulses. They're either on or off,
there or not there.
It's as if a computer has to
count using only two fingers.
So it uses Twos and Units.
Just like the way we count
has a name - the decimal
system - so the computer's
way also has a name. It's
called the binary system and it
uses just and 1 .
When a switch is off it's
called 0. When It's on it's 1.
Here are the numbers from
one to seven using binary
numbers:
1 10 11 100 101 110 111
It looks impossible to under-
stand, but it's really easy.
Suppose you were told to
count up to seven weeks using
just zeros and ones.
All you have to do is count in
weeks, fortnights and months.
The table below shows how
you can think of it.
So now you can already
count up to seven in binary. In
next month's L&t's Compute!
we'll go further along this
clever road of counting.
months
fortnights
weeks
1
So 1 = 1 week
1
So 10 = 2 weeks I
1
1
So 1 1 =3 weeks I
1
So 100 = 4 weeks 1
1
1
So 101 =5 weeks 1
1
1
So 110 = 6 weeks
1
1
1
So 1 1 1 = 7 weeks 1
Counting
up to 7
in binary
Mouse
A lot of
computers
now have a
mouse as well
as a keyboard.
It just converts move-
ment in any direction into
pulses which are decoded by
the CPU.
Scanner
A scanner
converts a
picture on
paper into an
electronic image. As
the scanner passes over
the picture small electronic switches turn on
and off depending on whether light or dark
areas are detected.
NEXT MONTH: We look at how the CPU does its tricks!
LET$ COMPUTE' Octooer 1990 21
24 Hours Orderline
0597 87 784
. . . for prices that appear to have fallen off the back of a lorry
AT-286-12 COMPUTER
1 2 MHz Speed
512KB RAM. Space up to 40Mb
2HD/2FD Controller
5.25" 1.2Mb Disk Drive
Hercules Mono Card
Parallel and Serial Ports
Space tor 3 extra Drives
Enhanced Keyboard
12" or 14" Monitor
1 year wananty RTM
OUR PRICE £595
SUPER AT+
AS ABOVE WITH 1 Mb RAM
20Mb HARD DISK
OUR PRICE £795
MICE
Tecklink inc. Image 72 £29.99
Aero Mouse inc. Dr Halo £29.99
Aero Trackball inc. Dr Hak) £35.99
Above Inc. Software & Accessories
Atari Mouse £17.99
Amiga Mouse £19.99
Amstrad 1 51 2/1 640 £9.99
DATA SWITCHES
FOR USE WITH ALL COMPUTERS
All metal case with rotary switch
2-way 36 pin Cent £14.50
2-way 25 pin D-Type £12.50
X-over 36 pin Cent £19.22
X-over 25 pin D-Type £18.22
DATA CABLES 1
IBM Parallel 2MTR
£7.25
25 to 25 M/M 2MTR
25 to 25 M/F 2MTR
£7.25
BRANDED
DISKS
u
I
1 1 BENCHMARK
1 J 37/ DS/DD
■1 I 135 TPI
50
£27.95
100
£49.95
200
£92.95
400
£177.95
BENCHMARK DS/HIGH DENSITY
25 £32.00
50
£58.00
100
£106.00
200
£199.00
400 ,
£370.00
[ 1 BENCHMARK
5V. DISKS
■■ DS/DD 48/96 TPI
a
100
£29.90
200
£54.00
400
£124.20
BENCHMARK DS/HIGH DENSITY
25 £17.40
50
£30.00
200
£104.00
1 1 BENCHMARK
I 1 37/ DISKS AND
H BOX OFFER
400
U
£245.00
20 3.5" DS/DD +80 cap. box ,
40 3.5" DS/DD +80 cap. box
£19.95
50 3.5" DS/DD +80 cap. box £34.95
70 3.5" DS/DD +80 cap. box £44.95
All disks 1 00% certified & guaranteed
^J BENCHMARK I 1
5 . DISKS AND
■■ box offer mm
All boxes inc. lock and dividers
25 5.25" DS/DD +100 cap. box £13.62
50 5.25" DS/DD +100 cap. box £20.24
75 5.25" DS/DD +100 cap. box £26.28
100 5.25" DS/DD +100 cap. box ,, ,£31.50
All disks 1 00% certified & guaranteed
All boxes inc. lock and dividers
P UNBRANDED DISKS
5
100
200
400
600
800.
1000
a
100
200
400
600
800
1000
Al
.25" DS/DD
£27
5.25" DS/HD
100 £50
200 £94
£49
£93
400....
.£170
£139
600 £260
800 £330
1000 £375
3.5" DS/HD
100 £95
£178
£215
I.5" DS/DD
£41
£74
200....
400....
600....
800
1000..
:ified & gi
£180
£357
£518
£670
£812
jaranteed
£139
£200
£256
£320
II disks I00%cen
DISK
BOX
SPECIAL
3.5" 50 capacity £5.25
3.5" 100 capacity £6.50
5.25" 50 capacity £4.95
5.25" 100 capacity £6.50
Inc. locks and dividers
ACCESSORIES
14" Monitor Stand £13.99
Universal Printer Stand £7.95
Mouse Pocket £2.50
Rigid Mouse Mat £4.50
3.5" Library Case x 5 £4.75
5.25" Library Case x 5 £4.75
DISK DRIVES (External)
3.5" for Atari 1 Meg (720k)
incPSU £69.50
Amiga 1 Meg (880k)
£67.50
STACKABLE DISK BOX
3.5" 240 Capacity £17.99
5.25" 160 Capacity £17.99
Boxes are lockable and stackable
horizontally and vertically
Manor Court Supplies Ltd, Glen Celyn House, Penybont, Llandrindod Wells, Powys, LD1 5SY
All prices include VAT & P&P. UK orders only Telephone 0597 87 792 Fax NO. 0597 87 416 Educational and Government orders welcome
i
_
be one of
the first to
own one!
• It will work on ANY computer
• ANYONE can use it
• It needs NO instructions
• It is TOTALLY friendly
But this is more than a piece of software,
it's THE very latest computer add-on . . .
I t's a C omputer Critter!
There are four types of Critter - a rabbit,
bear, bulldog and dragon. Each has a furry
head, arms and legs - and the dragon
even has a tail. These attach to your co
puter by strips of velcro to become yo
machine's cuddly guard and friend.
Now you can adopt your own Computer
Critter - with this special, money-savins
offer from Let's Compute!
Their shop price is £25 each. But we'll send
you one for just £15 - a saving of £101
These colourful, furry computer add-ons are beautifully
made. They can be fixed to your monitor in seconds.
They're all set to become the next big computer craze.
Certainly you can expect to see a big invasion of them
this Christmas.
But the/re watting for good homes NOW!
So the sooner you send off the coupon the sooner
you'll have one standing guard over YOUR computer!
Please send Computer Critter(s) at £1 5 each
My choice: L Rabbit L Bear Bulldog Dragon
3601
360?
3603
3604
I wish to pay by:
Cheque Eurocheque made payable lo Database Publications LW
E*p»ry
AccessWaslefcard'Eu'OcafCiBafCiaycafoVVisaX^onect o*«
/
Name
Signed
Address
Postcode
teytime telephone number in case of queries
Send to: Database Direct, FREEPOST, Ellesmere Port,
South Wirral L65 3EB (No stamp needed it posted in UK)
Order at ANY time
of the day or night
Don't forget lo give your name.
address end credit card number
By phone: 051 -357 1275
By fax 051-357 2813
By MicroLink: MAG001
General Enquiries. 051-357 2961
AMowupto U days tor delivery
Introducing
Castle of
Adventure
Charlie's
Cheats!
Did you know that there Is a
built-in cheat for CPC Treasure
Island Dizzy? At the title screen
hold down A P C and SPACE until
Dizzy appears. If you then press
C during the game and use 2 X K
and M you can move from screen
to screen. When you get to a
screen you like press space and
off you go.
Watch out for Mirrorsoft's Cadaver. It's a
role-playing game with a difference.
Everything's joystick controlled so there's
no need for boring typing in.
You play a bounty-hunting dwarf
searching a mysterious castle. It's stuffed
with treasure, gripping puzzles and
magical beasts.
Solve all the problems and you might
get to kill the Necromancer and become
exceedingly rich.
It's been programmed by the famous
Bitmap Brothers. They're the team behind
Speedball and Xenon 2. Due out shortly
for the Atari ST and Amiga.
Budget
Bonanza
Your pocket money doesn't stretch to full-
price software very often? Don't despair -
there are plenty of good budget games
on the market. Some of the best are re-
releases of old full-price classics.
Among the best of this month's bunch
are Encore's Ace and Ace 2 (£2.99).
These two brilliant flight sims are rolled
into one for the Spectrum, C64 and CPC.
Conflict (£4.99), is a playable intro to
wargaming. It's out on Virgin Master-
tronic's 16-Blitz label for the PC. Amiga
and Atari ST.
24 LETS COMPUTE' October 1990
BACK
TO THE
FUTURE 2
Matt Browne from Potters Bar has come
up with a poke for Alternative's Microball
(BBC Micro and Electron). This blocks off
all the holes so that the ball cant be lost.
Just put your tape in the recorder and
type the following:
LOAD "PINBALL"
160 GLS:PAGE=t1200
RUN
LOAD "LOADER"
2007 fOR A=47C98 TO &7CDF:?A=127:NEXT
2008 FOR A=*6AB0 TO 46ABF : ?A=1 26 : NEXT
2009 FOR A=*6BC8 TO »6B07 : ?A=1 26 : NEXT
RUN
The eagerly awaited
Back to the Future 2
(Mirrorsoft £"14.99,
disc) is now available
for CPC owners. The
gameplay is not bad. But the mono
graphics in the main part of the game
disappoint.
It's nearly a year since Fighter Bomber,
first appeared pn the PC. Now it's made
it to the CPC screenson a £19.99 disc
from Activision.
It features welt produced 3D graphics
amd mission objectives. A worthy
successor to that old CPC favourite, After
Burner.
Do watch out though - some CPC
owners may have a problem. The
protection on the disc version prevents it
from loading on some machines.
Arc you £ liuUc Aiaiuc-c?
Is there anyone out there who
isn't a fan of Leonardo, Raphael,
Donatello and Michelangelo?
Those pizza-loving heroes in a
half-shell are about to make their
computer in a game from Image
Works.
First on the shelves will be the
PC and Amiga versions. Others
will follow except for BBC and
Archimedes users. Seems like
they'll be missing out.
Teenage Mutant Hero Turtles is
bound to be one of the hottest
releases this Christmas. So get
saving. Cowabunga!
*iOOO
Level -f Distance 4-
PIPEMANIA
Pam and her minions have been working
hard on Empire's addictive puzzle game
Pipemania. Here's the full list of
passwords for the Amiga and C64. Can
anyone help with the others'?
Amiga
Level 5. GRIP
Level 9: TICK
Level 13: DOCK
Level 17 OOZE
Level 21: BLOB
Level 25: BALL
Level 29 WILD
C64
Level 5: HAHA
Level 9: GRIN
Level 13: REAP
Level 17: SEED
Level 21: GROW
Level 25: TALL
Level 29: YALI
Are you a follower of Fourth
Dimension's Nevryon? Here are the
Archimedes passwords as discovered
by James Marshall and David Horner
fromTollerton:
Level 3: MIRADOR
Level 5: ISENGARD
Level 7 KRYNN
Mathew Elliot from Royston has
supplied the passwords for the BBC
Micro version:
Level 3: ARCHIE
Level 5; STEREO
Level 7: REBEL
f you've got any hints,
okes or cheats you'd
ke us to print send
lem in to us at Let's
ompute! Europa
louse, Adlington Park,
icclesfieldSKKMNP.
Think you know a lot
bout pop music
e's a program
'est you out
If you fancy being a quizmaster - now's your chance!
Clever Tina Turtle has devised a Pop Quiz you can play
on your computer. And she's made it easy for you to
change It Into any type of quiz you like.
After you've typed in the program and RUN It you'll be
asked 1 questions. Get one right and you move on to
the next.
If you get one wrong, you'll be given the right answer
before you move on to the next question. Note that as
the data is all In capitals you must answer In capitals.
Once you've answered all 10 questions you're given your
•core and a message.
At the moment there are two messages - printed by Lines 190
and 200. You can easily change them or - by inserting more
simitar lines - add messages of your own.
If you want to add more questions change Line 330 to say
how many there are in all. Then add more lines similar to
those already at 350 to 440 at the end of the program.
Start numbering the extra DATA statements at tine 450.
Obviously, if you wish you can change all the data at the
end of the program and put anything you want there. Geography,
history, trivial pursuit - any type of question will do. Dont forget
that if you change the type of quiz you'll also have to alter lines
100 and 1 20. This simple quiz has many uses. H you come up
with any novel questions mtui answers let us see them. There
will be a prize for any DATA lines we pin to the noticeboard.
REft Pop quiz
REN (c)Let's Coipute!
READ n
DIH SS(R):DIH S(R)
LET P=l
FOR C=1 TO H
READ $$(0,65(0
NEXT
CLS
PRINT:PRINT "Let's Coipute! Pop 8
FOR M TO n
PRINT:PRINT "HMch group or art is
ng ":PRINT SS(0;"?"
INPUT AS
PRINT
IF A$=6S(C) THEN GOSUB 231
IF A$<>GS(0 THEN 60SUB 271
NEXT
PRINT:PRINT:PRINT "You got ";P;"
of ";H
IF P>#.75*N THEN PRINT "That's no
IF P<=I.75*H THEN PRINT "You tout
better"
PRINT
END
REN RI6HT ANSWER SUBROUTINE
PRINT "Hell done, you're right"
LET P=P*1
261 RETURN
271 REN WRONG ANSWER SUBROUTINE
281 PRINT "Hard luck! You're wrong"
291 PRINT "The right answer is: ";G$<
C)
3M RETURN
311 REN DATA LINES
321 REN NEXT IS NUNBER OF QUESTIONS
331 DATA 11
341 REN NEXT ARE SONGS, GROUPS
351 DATA "1TSY BITSY TEENY WEENY","BO
NBALURINA"
361 DATA "TURTLE POWER","PARTNERS IN
KRYM"
371 DATA "LISTEN TO YOUR HEART","ROXE
TTE"
381 DATA "NAKED IN THE RAIN", "BLUE PE
ARL"
IH DATA "TONIGHT", "NEW KIDS ON THE B
LOCK"
411 DATA "YOU CAN'T TOUCH THIS","NC H
ANNER"
411 DATA "WHERE ARE YOU BABY?", "BETTY
BOO"
421 DATA "ENGLISHMAN IN NEW YORK", "ST
ING"
431 DATA "PRAYING FOR TINE", "GEORGE N
ICHAEL"
441 DATA "THIEVES IN THE TEHPLE'/PRI
NCE"
IS YOUR MACHINE HERE?
Electron/BBC/Archimedes/
ST (stos)/Amiga (Amos)/
PC (GW-Baslc)
The program will work as shown.
Commodore 64/128
Use capital letters throughout.
Change line 90 to:
9r PRINT CHRSM47)
Spectrum
Use 48k mode
Change line 40 to:
4| DIN SSIN*1,32):DIN G$(N,32):
DIN AS(32)
Insert a new line
135 IF LENUS)<1I THEN LET *$=«♦'
TO 135
50
2€ LETS COMPUTE' October 1990
H aal
'ik too* liib
\
Unit 4, B.D.C, 21 Temple Street, Wolverhampton WV2 4AN
Tel: 0902 25304
HIH/ia.lXIKON
ARCADE SOCCER BMl
BARBARIAN2 M/U
BLAST M/U
MIAN CLOUGH M/EL
COLOSSUS MIDGE 4 M/U
L ■ I Trl .... rBw/£b>
am ••'U
CXIU M
fOOTBAU MANAGER
HOUDOUT
HaiD OUT EXTRA VOl 1 M/U
MOUO OUT EXTRA VOl 2 M/U
KLAX M
LASTNRNIA2 BBVEl
UCENCE TO OX M
■wINI Ur'Tvt £ ■ *m^m
MINI OfUCf 2 (40 TRACK) , M
MINI OFFICE 2 <**> TRACK) N
nevryon M
PEBPUXITY M'U
r^lMArpA r PBBYeL
P™rDATO»l h-^P
QUESTION OF SPOUT M/CL
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COMPILATIONS
PLAY FT AGAIN SAM 1 3
PLAY FT AGAIN SAM 12
PLAY IT AGAIN SAM 1 1
PLAY FT AGAIN SAM 9
PLAV FT AGAIN SAM 8
PLAY IT AGAIN SAM 1
PLAY FT AGAIN, 1AM 6
PLAY IT AGAIN SAM S
PLAY IT AGAIN SAM 4
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M US OIK 8 99 M 3 5 DISC 9 99
LAST NINA BY FAIR MEANS OR FOUL, SKIRMISH k BLAGGER BB/lL CASS 6.99
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8 99. BB 1 5 DISC 999
CAMEIOT. STEVE DAVIS SNOOKER. SPVCAT fe THE UFE Of REPTON M/U CASS
6 99 M S 2S DISC 8 99
WINTER OLYMPIAD, QUEST, MR W12 h AROUNO THE WORLD IN fORTY
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M/U CASS 6 99 BB S 25 DISC ■ 99
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32 99 BETA BASE UDUTKS
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HEROES
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QUATTBO ADVENTURE
WORLD CUP COMPRATION
COMPUTE GAMES CENTRE
QUATTRO POWER
QUATTRO SPORTS
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MEGA MIX
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KARNOV GRYZOR. BARBARIAN. CRAZY CARS. PREDATOR. COMBAT SCHOOL. PLATOON
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PETER BEARDSUrS INT FOOTBALL. SOCCER SUPREMO fOOTBAU MANAGER, WORLD
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FOOTBALL MANAGER 4 99
FOOTBALL MANAGER 2 H EXPANSION KIT 1 1 99
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TIE UFA* UNNiS
TIMES Of LORE
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LETSC10
More objects means
more fun. Our ace
artist Mike Goldberg
The last two month's listings gave you a basic game with monsters, a
few objects to collect and hyperspace. If you've typed them In you're
now ready to add this month's features.
So what's new? Well, to start with you'll find the baddies laying
bombs at random intervals. March Into one and you'll die!
But If a baddie touches a bomb it only moves to another part of the
screen. So beware! It could move right In front of you.
Another object added by this listing Is a twin symbol. If a baddy
moves over this it creates two clones of itself. You could end up with
as many as 1 2 monsters.
The idea Is to reach these objects before the baddies. There's also C
symbols which give you a bonus when you collect them.
And watch out for the yellow OFF switch. Run over It and
the baddies will grind to a standstill for a few seconds.
The final new object is the thumbs-up sign. When you run
over one all the bombs disappear.
Before adding the new features to your existing program
you need to renumber It. How you do this Is explained on
the right. Then just type in the listing and your program will
be modified automatically.
The lines printed in red are new ones. Blue indicates lines
altered. And If you type in the line numbers shown in orange
these old lines will be removed.
The green areas show you all the new procedures and the
REM lines explain what they do.
When you've made these changes save the game using a
different namm to the one you used before.
Your game will now have all the extra features
we've described. Enjoy playing until next month when
we'll show how to give your game a final polish .
30 LETS COMPUTE! October 1990
J (J
v~r~~
Horo's how to ronumbor last month'*
program raady to ontor this month's
extra bits:
• LOAD last month's program
• Type RENUMBER and press Return
• SAVE the renumbered program (use
a different name)
• Type DELETE 10,1840 and presi
Return so you're left with just the
DATA lines.
• Type RENUMBER 8000, (note the
comma) and press Return. This
renumbers the data lines so they can
stay at the end of the program.
• Save the data lines to tape or disc
using the following commands:
•SPOOL DATA
LIST
After the lines have listed
•SPOOL
• LOAD the renumbered program that
you saved a few minutes ago.
• Delete the existing data lines by
typing DELETE 1850, (note the
comma). M
• Put the renumbered data lines (the
ones you saved using 'SPOOL) on the
end of the program by entering:
•EXEC DATA
• LIST the program to check that the
main part is numbered from 10 to 1840
and the data is from 8000 upwards. If
it la, SAVE H. If not, try again - taking
care to follow these instructions
exactly.
90 DimjX(12),VZ(12)
I
111 DIRdS(2)
112 ©bZ=4:DlAo$(obX>
113 noX=7:0maZ(noZ)
1U F0RIZ=2T0noZ:READhaX(U):NEXT
115 DATA7, 64,4,112, 241,1
182 IFRND(50)=1PROCrnd
201 IFstpX=0PROCbid
292 IFstpZ=1:IFRND(100)=1ttpX=0
461 VDU23,229,64,64, 32,16, 0,24,60,126
462 VDU23, 230,102,106,102, 106,102,126,
60,24
463 ¥01123,231,1,5,37,43, 51,18, 28, 73
464 V0U23,232, 255,140,28,22, 55, 237,137
465 VDU23,233,0,0,0,10,50, 18,28,8
466 V0U23, 234,60,12, 28,22,54,40,0,0
467 VDU23, 235,0,0, 0,0, 0,16, 28, 8
468 V0U23, 236,24, 12,24,20,0,0,0,0
471 V0U23, 237,76, 82,82,50, 28,16,56,16
472 V0U23,238,56,16,16, 112,152,148,149
,98
473 VDU23,239,126,255,189,255,231,231,
255,231
474 V0U23,243,231,231,231,255,255,189,
255,126
475 VDU23,244, 240,208, 247, 245,103, 103,
242,247
476 VDU23,245, 247, 247,247,247,247,247,
247,0
477 VDU23, 246, 16, 16,24, 28, 12, 118, 118, 6
478 V0U23, 247, 246, 246, 6, 246, 246, 4, 112,
112
571 bS=KS*CHR$2*CHR$229+DS+CHRS230
Ml dS(0>=K$KHRJ2*CHRS231*D$*CHR$232
573 did )=K$*CHR»2*CHRS233*D$+CHR»234
574 d«(2)=K$*CHRS2KHR$235*D*+CHR$236
575 o$tl)=K$*CHR$1KHR$237*D$tCHR$238
576 0S(2)=K$KHR$2+CHRS239*D$KHR$243
577 o$(3J=K$*CHR$2KHR$244+DS*CHR$245
578 oS(4)=KS+CHRS1+CHRS246+DS+CHRS247
580 «X=4:lwZ=WZ:SZ=0
601 eZ=10
915 stpl=0
1122 P2t=?<l5800*<(XXnZ>M6)t((YZ*yZ)*
320))
1130 IFPZ<>0ORP2Z>0PROChit:IFhZ=0ENDPIO
C
1242 uZ=?U5800+((UZ(zZ)*DZ(RX>>*16)*<(
vX(zX)*EZ(RX))»320>>
1245 wZ=P0lNT(pZ,qZ>
1250 IFuZ<>0PROCb»dhU:IFbhZ=0zZ>(zX*1>
N0D(UZ):ENDPR0C
1260 IFRND(eZ>:lNPS=bS£LSEMPS=BS
1262 PRINTTAB(UX(zX),VZ(zZ))WPS
1453 F0RIZ=2T0noZ
a •» i i
i -. e« ** : t '
co O c
c
cc
1 , coo
>iC
Ills-
c o
CO C C
o
oo o o
. OP
> o
o
c c
CO
co cC
* c
1 "°
BOMI
SONUS
switch
OBJECTS
Made from
characters
You
Baddies
227 and 228
and ?30 237 and 238 239 and 243
Collect them Die on contact Get bonus Turn off baddies
1454 tFP2Z=h«Z(IZ)hZ=II
1455 NEXT
1460
70
1480
1520 ]FhZ=1ANDLZ>0GO$UB1850:PROCdie:IFL
X>0PROChs
1532 IM=3«O$UB1850:PROCdte:iFLZ>0PROG
hs
1533 lFhZ=4SOUNO3,-13,0,1:PROCscorelRHO
(1200)*5)
1534 JFhZx5SOUND3,-13,90 / 1:stpZ=1
1535 IFhX=7PR0Cuxb
1590 IFbhZ=2$OUND2,-15,230,1:GO$UBl840:
PRINTTAB(fZ,gZ)C*
1595 IFbhZ=3SOUND2,-15,199,1:GO$UB1840:
PRINTTAB(fZ,gZ)b$
1596 IFbhZ=6AN0MZ<12L«Z=WZ:WZ=WZ*2:F0RI
Z=lwXTOMX-1:6OSUB1840:UZUZ)=fX:VX(lZ)=g
Z:PRINT1AB<UZ(1Z),VZ(1Z))HS:NEXT
1650 IFUZ(z:)*DZ(RZ) = nAHOVZ(zZ)*EZ(RZ)
=YXbhX=1:ENDPR0C
1660
1670
1680
1682 F0RlZ=2T0noZ
1683 IFuZ=haZ(IZ)bhZ=IZ
1684 NEXT
1785 VZ=4
1850 LZ=LZ-1:COLOUR128:COLOUR2:PII«TTAB.
(2,2);LZ:$OUND1,-12,90,1:RETURN
2000 REN ••• DIE *«
2010 OEFPROCdie
2020 FORIZ=0TO2
2030 PRINTTA6(XX,YX)dS(IZ)
2040 PR0Cdelly(5)
2050 NEXT
2060 PRINTTAB(XZ,TZ)B$
2070 ENDPROC
3000 REN "* RND ***
3010 DEFPROCrnd
3020 6OSUB1840
3025 QZ=RND(obZ)
3030 PRINTTAB(fZ,gZ)oS(QZ)
3040 ENDPROC
4000 REH *« UXB *••
4010 DEFPROCuxb
4030 ieiZ=t5F90:ttZ=i»Z
4040 F0RJZ=6T026STEP2
4050 F0RIZ=U018
4060 IF?te«Z=64PRINTTA8UX,JZ)BS
4070 ieiZ=aeiZ*16
4090 NEXT
4100 ■■l=BiZ*640:ieiZ=u:
4120 NEXT
4130 ENDPROC
HH'*/ IH
THUMBSup
?AA ir\H OAZ.
Move them Move 1
Erase them Erase them
246 and 247
■ Remo ve bombs
Clone two more I Erase them
SOMR/n
host
31
9.
Subscribe at the same
ere's YOUR chance to become a member of
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Send me the next 1 2 issues of Let's Compute for the special
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PleaseVsend
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\
ZA «e»
■
TTus ptefc Ddonft K>
UTS
[COM 1
CLU
. p-
airnMEHi
\fr-^
'
I
r
COM r .U«/
.^^SK
• —
rittUft
I"
!2__ f
cam fin'
i
This l$ :h* BBC WUon - offer vtnJon* m// wy
Your own logo disc or tape for £1 !
Turtle graphics is a
vital part of any Logo
program. And that's
what Turtle Logo is.
Specially written for
the Electron, BBC
Micro and
Archimedes series, it
is on the tape or disc
that comes with the
Let's Compute! Club
bumper pack.
You can find out
how to join the Club
on Page 32 - and
about all the other
goodies you can get
with it.
However, if you
only want Turtle
Logo we'll send it to
you for just £1 if you
complete and return
the coupon below -
ORDER FORM
Please send me the Let's ■
Compute' Turtle Logo. I :
: enclose cheque, postal order
or stamps the the value of £ 1 .
(Only suitable tor Electron, BBC '■
; Micro or Archimedes series I
: Name
Address . .
Postcode
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Please send it on
r :5.25in40Tdisc
□ 5.25tn 80T disc
C3.5indisc
Cassette
: SEND TO.
Logo Offer.
Let's Compute!
I Europa House ■
Adlington Park
1 Macclesfield K
1 SK10 5NY
j
34 LETS COMPUTE! October 1990
Oh
yes
It Is!
LT 91
FD (0
FD 551
RT 90
BK 11M
FD 30
PU
PU
LT 90
FD 20
FD 111
PD
PD
FD 150
RT 90
PU
FO 11M
FD 20
BK 511
PD
LT 91
FD 30
PU
RT 90
FD 200
FD 60
PO
LT 90
RT 181
FD 20
FD 241
LT 90
PU
FD 20
FD 31
PU
PD
FD 100
FD 20
PD
IT 90
FD 20
FO 200
LT 90
RT 91
FD 20
FD 20
LT 90
PU
FD 40
FD 20
RT 45
PD
FD 80
FD 70
RT 45
LT 90
FD 30
FD 20
LT 90
LT 90
FD 5
FD 20
PU
PU
FD 15
FD 100
PD
PD
FD 200
FD 20
RT 90
RT 90
FD 125
FD 20
RT 90
RT 90
FD 200
FD 20
PU
RT 90
FD 20
FD 20
PD
LT 90
FD 200
%dfr*0>
Here's
another program
written in the
turtle's favourite language, Logo. Unlike the knot
patterns in previous issues of Let's Compute! this one
draws a REAL knot.
It creates a Highwayman's Hitch. That's the kind of
knot used for tying up horses or boats.
It was sent in by Neil Melville (10) of Maidstone,
Kent. Uses only very simple commands.
But it shows how, with just one or two of the Logo
instructions and a bit of patience you can create real
diagrams.
To try this program out yourself you first need to run
the Logo Language.
If you haven't got it and you're using an Acorn
computer the Let's Compute! Turtle Logo is an ideal
starting point - see the offer on the left.
Then just type in the instructions and watch the
knot draw move by move. If you already know how to
define procedures you can put all the instructions in
one. Then you can call it every time you want to draw
the knot.
If you don't know how to define procedures, keep
reading Logo Lowdown. You soon will.
If you can draw a knot - or anything else - in Logo
let us see it. Send us a listing if you have a printer
and also send us the program on tape or disc. Also,
let us know which version of Logo you used.
Send it to Let's Compute! Adlington Park,
Macclesfield SK10 4NP. There's a super Let's
Compute! baseball cap for the writer of every one we
print.
wonpsrS
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Carl Wilson,
Winchester, Hants, ?-*>
Age 14
V\2 S.f^-gouw
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Rowena Shuttleworth,
Ravens head,
Nottinghamshire
Age 12
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Normanton,
Derby,
Age 14
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Dublin, Ireland,
Age 12
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St. Helier, Jersey,
Age 7
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3d LET'S COMPUTE' October 1990
J
MAcHtfe
The turtle invasion has ended! Over the last
couple of months the Let's Compute! office
has been flooded out with the creatures - all
because ace artist Mike Goldberg challenged
you to design a Supa Turbo Turtle.
• Pictured left is the winner - a magnificent
effort from Neil Giggins (13) from Towcester,
Northants. Mike's worked his magic on Neil's
design and produced the stunning painting
above. It will be given a fab frame before
being handed over to Neil.
• Among its many features are a 300,000
decibel siren to warn animals out of the way,
an arm to rub off splatted flies and a laser to
blast non-moving objects to smithereens.
This six wheel drive creature with spiked
tyres has been designed to reach incredibly
high speeds.
• The five runners-up whose turtles arc
pictured opposite will each receive Let's
Compute! baseball caps.
There's another Mike Goldberg
challenge on Page 43!
LETS COMPUTE' October 1990 39
VAT INCL. ADD £2.85 P&P. ADD £9 NEXT DAY DELIVERY
AMIGAS
BATPACK £355
FLIGHT OF
FANTASY £357
CLASS OF
THEWS £493
Mouse Mai £2X0
Cleaning Kit £2
Ram Pack £40
+ clock £45
Cumana ext
drive £66
\TARIS
DISCOVERY £259
EXTERNAL
DRIVE + PSU £67
ZIP STICK £11
CHEETAH 125+ £6.90
a
* C64 WORLD CUP PACK £130 *
I \M.OKM-M>4 HEQ1 KS Klll.l.vl III,
349 DITCHLING ROAD, BRIGHTON BNI tJJ
Itl: 0273 506269 (mobile phone: OS M 279084) 7 da>s 24 hours
Mijas Software
The New Issue of
'A Book on C by
Berry And
Meeklngs
ill inclusive.
Small C System £69 (inclusive of vat p a p >
Use Ibc Mijas Small C System m the BBC B or MASTER series computers
for games, educational and industrial software. Small C programs run up
to 12 times faster than in BASIC. Your code Is highly portable and can be
recompiled to run on the ARCHIMEDES or RI40 using the Acorn ANSI C
compiler (not supplied) and on many other machines. You can also use the
power of the ARCHIMEDES for the rapid development and test of BBC B
or MASTER programs. Manuals and post sales support included.
This Small C System produces stand-alone programs with up to 40K of
code in ROM and/or MAIN memory. Libraries, extendable by the user,
provide memory allocation, multi-mode graphics, file handling, t'o
formatting, string handling, and system calls. Full assembler interface.
The system includes the V3.0 Small C compiler & Libraries", Oplimiscr,
Assembler, Linker, Source-Level Debug^nd SHELL. SOURCE CODE is
supplied for the compiler and all libraries. Using the MAKE facility and
editable makefiles, C code is automatically compiled to assembler source,
assembled and then linked with the minimum necessary library code.
Available for the MASTER series Computers, BBC B* or B with sideways
ram, and ARCHIMEDES. Software supplied on SOT double sided 5.25" or
3.5" ADFS or DFS disk. The ADFS disk contains the SHELL source code.
The system is also available for other hardware configurations, including
systems for the Mitsubishi MELPS processors, please write for details.
Laser Typesetting Program £23
inclusive
Low cost DTP for any BBC B, MASTER or ARCHIMEDES. Requires an
HP Deskjet or Laserjet printer or emulation. Use for letters, booklets,
forms and manuals with rules and shading, full multi-font justification, in
single or multi-column. Fast printing using the printer's internal fonts.
ADFS or DFS disk with rom image, £23 Inclusive of vat, p&p. Eprom
(avoids the need for sideways ram on BBC B) £7 extra.
Please state your computer system when ordering frorn:-
MIJAs SOFTWARE, Winchester Rd. Micheldevcr,
Winchester, Hants S021 3DG. Tel 0962 89 352.
Official orders, ACCESS and VISA Welcome
'Includes original Small C code supplied at the cost of distribution.
Spell Book 4-9 Years
Things To Do With Words
Things To Do With Numbers
Maths With Bill) Bear
Puzzle Book 1 4-90 years
Puzzle Book 2 4-90 Years
Puzzle Book 3 4-90 Years
Puzzle Book 4 4-90 Years
Wl
Lets Spell At The Shops
Lets Spell At Home
Lets Spell Out And About
Ail of t*t j«»e art mo t.tttt <n frtneti
$w£
■V' < wAHE
19 QUARRY HILL ROAD, TONBRIDGE,
KENT TN9 2RN
Phone (0732) 351234 Fax (0732) 770234
School and Government order* taken
*•"'
ta»bfc»i
WHII
•!• «
..*..**.........* »,t»...»l.
■
I "■
Catd
WY\
Leave £10 in a
piggy bank and a
year later you'll
still have £10. But
put it in a bank
account and in
the same time it
could have grown
by an extra 70p.
This program teaches your computer how to work
out your bank interest.
And shows you how that nestegg will grow and
grow.
How much you can mako depends on two things:
Tho present interest rate - which can chango at
any time. And how long you loava your money in
tho bank.
To find out how much interest you're earning Just
answer tho simple questions your computer will
ask you. Have your bank book In front of you. You'll
need to toll the computer about each time you put
money in or took some out.
First you'll bo asked to give tho date you did this.
Typo it in as throe numbers, separated by commas.
So, November 5 this year would bo entered as:
»t11,*0
Than you need to say how much you put in or
took out. If you took money out, put a minus (-) fin
front of tho number you typo In.
Next, tell tho program what the interest rate was
at the time. You're then askod if you want to enter
any more. You can reply Y or N.
If you answer Y you'll got tho same questions
again. Like this, you can make as many entries as
are in your bank book. If you answer N you'll be
askod for today's date.
Once you've typed this in, you'll bo told what
interest you're now duo.
11 REN Interest
21 REN by Ken Hughes
31 REN (c)ltt'l Coipute!
41 DIR DC1M)
51 DIR h-dffl)
61 DIN Y(HI)
71 DIN C(lll)
SI DIN R(1II>
91 CLS
111 LET N=l
111 LET N=N*1
121 INPUT "What is
,y)";D<N),N<N>,Y<N)
131 INPUT-Ho* auch*
ni INPUT "What interest rate\'R(N>
151 LET R(N)=R(N)/1H/365
161 INPUT"Do you want to enter aore (Y
171 If AS="y" OR A$="Y" THEN 60T0 111
181 IF ASo-n" AND A$o"N" THEN GOTO 1
the entry date (d,a
;C(N)
61
191 IF Td)<1M THEN Y(1)=Y(1>*19ll
211 LET MM
211 INPUT"Enter today's date: d,a,y ";
D(N),H(N),r<N>
221 LET TBAL=I
231 FOR N = 2 TO N
241 IF Y(N)<1II THEN Y(N)=Y(N)*19ll
251 LET T1=D(N-1)*(N(N-1)*3I.5)*(Y(N-1
)*12»3l.5i
261 LET T2=D(N)»(N(N)*3l.5)*(Y(N)M2 i 3
1.5)
271 TENPDAT£=T2-T1
281 LET TBAL=TBAL*C<".-1)
291 LET TBAL=TBAL*(TBAL«R(N-1)*TENPDAT
E)
311 NEXT N
311 LET TBAL=INT(TBAL*1II)
321 LET TBAL=T8AL/1II
331 PRINT:PIINT"You now have: ";TIAL
Averaging it out
To keep the Hating short we've told
your computer each month has 30.5
days rather than 28, 20, 30 or 31.
This means that the results ave net
awjtto ac c urate - but not that far out.
IS YOUR COMPUTER HERE
C64/128: Change line 90 to:
90 PRINT CHRSIU7)
ST (Stos) Amiga (Amos): Put #
after all the vahable names that don't
end in $. So D(100) becomes D#(100).
TBAL becomes TBAL# and so on.
M LISTING WORKS AS IT IS ON OTHER MICROS
LETS COMPUTE' October 1990 41
GAMES "*$ &93G&
stems
!Mt MW) at 33p p»* fl*n c^eap rat* and 44p pvt m»*i «f «n oft*' hm#^
( Ai* «noew pay* p*on» 0*1 )
Al COMPUTER SERVICES
For your Computer Repairs
and Supplies
We are Authorised Amstrad Dealers and also
an authorised Microvitec Service Centre.
Used Equipment bought and sold. We also supply
ribbons and discs at discount prices
Leasing and credit facilities available
9 PADDOCK MOUNT, DAYVLEY, TELFORD,
SHROPSHIRE. 114 3PR bsssssssh
Tel: 0952-502737 visa
Fax: 0952 630110
Access
Cambridge International Software
8 Herbrand St., London WC1N 1HZ
071 833 4023
ARCHIMEDES AUTUMN FAIR
October 27 & 28 (Sat & Sun)
10am - 5pm
100's of Archimedes Products and
demonstrations under one roof
Hardware, Software, Games, Music,
Educational, CAD, Books, Disks,
Video, Printers etc etc.
£1 entry - raffle - refreshments
Exhibitors include:
Dabhand
A & B ■
CIS
Arxe 1
Ampsound
Brainsofl 1
Mijas
Minerva I
Apricote
RTFM I
Electronic Font Foundry
Calligraph 1
MJD
Acorn 1
and many more
{ANSWERBACK
Junior Quiz
If you like quizzes this program is for youl
There are 750 general knowledge questions for you
to try. Each time you find the right answer you can
have another turn in the game. Can you defeat the
dreadful dragon and save the owner of the Castle?
The program even lets you write your own quizzes
and save them on disc or cassette
- amaze your friends!
BBC/Electron AmaU ad casa C9.95 Spectrum caaaotle C8.95
BBC disc (40 or 50 track) £1 0.95 BBC 3.5" disc £1 2.95
Arnatrad CPC 3" disc £13.95 Spectrum +3 disc £10.95
IBM disc (3.5" or 5.25-) £19.95 Amiga/Atari disc £19.95
Prices Include VAT and P&P
Kosmos are specialist producers of Educational
Software designed to help you enjoy learning from your
computer over a wide range of subjects.
Write or telephone fora FREE 20-page BROCHURE
of our Educational & Leisure software
Please state your computer type
Kosmos Software Ltd, 1 Pilgrims Close, Harllngton
DUNSTABLE, Beds. LU5 6LX
Telephone 05255 3942 or 5406
ntosmos
a s_c r k a e *
f
•
/
lit* Mflta Goldlzarz cfrzffffigfzl
How to enter
Study these two pictures. There are
not exactly the same. On the right-
hand picture circle all the differences
you can spot.
When you've found them all - and
don't stop at 10! - fill in the entry
form below. Then just cut out (or
photocopy) this page and send it in
before October 31 .
. . . this unique,
hand - painted
jigsaw. It was
specially made
by cartoonist
Mike Goldberg, the
creator of Rom and
Ram, and will be
personalised with
the winner's name.
Postcode
My computer is:
Send this comple page to: Spot the Difference
Competition, Let's Compute! Europa House.
Adlington Park. Macclesfield SK10 4NP.
-
LET'S COMPUTE' October 1990 43
An exit poll
conducted at
last year's
Computer
Shopper Show
revealed that 95
per cent of
customers
reported
"substantial
savings" from
purchases -
with individual
figures ranging
from £50 to
more than
£1,000!
* One-stop shopping for ALL your
computer Christmas presents!
* Hundreds of stands packed with
special show bargains!
* Expert advice to help you make
the right choice'
mma^mm
^^
HH
^^■^V
Please send me
Adult tickets at £4 (save £1 )
Under 16s tickets at £2.50 (save £1 )
I expect to attend the Show on:
□ Thursday D Saturday
Friday D Sunday
I would like to pay by:
Cheque payable to Blenheim Database Exhibitions
D Visa a Access
L
Family tickets - admits up to 2 adults and 2
children -£12.00 (save £5)
I am interested in:
D Acorn C Amstrad
IBM □ Other
Atari Commodore *
Name
Address
Signed,
Please return your completed onter form to:
Computer Shopper Show Ticket Office,
PO Box 2, Eltesmere Port, South Wirral L65 3EA
Postcode
LC10
RING THE SHOW'S
24-HOUR HOTLINE
051-357 1736
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PONT MISS A THING! Take out a subscription: Page 32 Tell your newsagent: Page 42
C Commodore
Commodore A500
Flight Of Fantasy
-
I
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A500 BATMAN PACK
The Commotio** A500 Batman Pick mu$1
surety f enk as on* of the most popular com-
puter packs aver 1 Th* pack feature* the
Commodort Amiga 500 computer with
mouae controllar arxJ TV modulator p*us
four lop software titles The aoftware in-
clude* 'Batman The Movte ■ Rtd Gotham
City of the cunnmg joker, in Ocean** lop
selling title baaed on the blockbuster Bat
man film; New Zealand Story -hfghquai-
ty conversion of the leading arcade gam* p
Interceptor ■ Dogfight with two F 16* *n
this leading flight simulator. Deluxe Paint
tt ■ top quality Amiga graphics package
wh*ch set the standard for others to follow.
Return the coupon for further details
PACK INCLUDES:
ASOO Computer & MouM C399.99
A520 TV Modulator £24 .99
Batman The Movie £24.95
New Zealand Story £24.95
Interceptor £24 95
Deluxe Paint II £49.95
TOTAL WP: £549 78
Less Pack Saving £150 78
PACK PPUCKi C9M-00
INC
VAT
AMIGA 2000
For the more serious or prof ess ional applica-
tions uaer, Commodore have a selection of
sy*emt baaed around the expandable Amtga
2000. at price* from C1?95*VAT. The A2000
features a M 1Mb RAM ( expandable lo 9Mb).
9 system expansion slots, plus IBM com-
patibility with th* use o* PC-XT or PC AT
brtdgeboards Complete and tetutn the
coupon , putting a t*cfc
*n the A2000 bo«, tor
«t*t$ of A2000 com-
puter systems- **T- C
£1295
FLIGHT OF FANTASY
Fi*gm of Fantasy »s the very latest Amiga 500 pack from Commodore,
featuring BRAND NEW software releases io make this the moet spec-
tacular ASOO pack ***** The pack feature* the Amiga 500 computer
with mouse controller and TV modulator as well as tour top software
titles. These include the following;
DCLUXC PAINT II
Th*rvg*W*»YL
Ml thf> HandSrd tor otft** AmtQ* art
perflSQM OsHii* P*rt M >ACtud*ft
pcmeMuJ s*sy lo uh loo's tfuf bong
out the ftrtiot *ft you Cww maw
poem pf*M*nta*om 3D i
op lustoMtf*
ESCAn *Q9QT UQHSTiRS
H«tj t hommtorq c ompmsi i i
a soence Keen #or> **r> comtc
boot it*** fluprne* Ch* tmv% Jft*#
#nd Du*» mrm on th# Pf*r»ft X re*cu
trig Human* who ntv* D**p> c**Jtn f »0
Dv !*»• Rood Uon*l»n» and forced to
C3*#*i an aw Roooi Army lo DCSTROr
EATTT K* Jwe and Ck**a fgM t*e* »■,
ChfOUQ* hOfUS* Of *Yil RoOXKf 10 *•*!>
the Mumirii **C4pa
RAINBOW ISLANDS
P29 RBTALIATOP
Th* jfcna* m ISo/l fmuWon wff ■ onOKS
of 1*0 a*tr an and lou' berti* •^wmant*
*»fn OOMAA Of dmV»rtf tactical rrmt*om
Aa**>£emt>aJ tir*t»e*c fcomemot ******
uy grooAj paaao batttes. •*«Q»ng camera
ir>a :.■»! of W^N 4 and**** «*•! t*m*
cocftpii display*. iftfvO'fto, vu* 'ada*
•nnanc* in* ***p'«*C «*#» O* It** atanning
f>muWil*on
Sap on your fujpc **o** P'*C»*e
growing s ra+nto* lAfl yQtf't nMO>
Iogo-Hfcn<]no0i>»ng Fro»** tha l***r*c
of Oon to Monw l»i*nd m **** «n
countor Don nttTPMfff . *-nging n » C^
MW combat mftcn-nai m#ch«n4C4V
•StfriiTtt lr^« ■o*«*d*&** 0«>ngf) of
t*9*no and to*My* F-n*»»y •«**' *p*a
aflrtd of o*nxn#H and >t> mfw>M*«^
PACK INCLUDES:
A500 Computer A Mouse 1 399 99
A520 TV Moduletor C24 99
Deluxe Paint II C 49 95
Eacape/Hobot Monster* £19.99
Rainbow Ittanda C34SS
F29 Relalielor C?4 95
TOTAL RRP: £54482
less Pack Saving £1456?
PACK PRICE: CJttt-00
£399
FOR FURTHER DETAILS OF THE AMIGA
RANGE, COMPLETE THE COUPON AND
RETURN IT TO SILICA SHOP
THE UK's No1 AMIGA SPECIALISTS
SILICA SHOP OFFER YOU
FREE OVERNIGHT COURIER DEUVERr On all hardware orders shipped in the UK.
TECHNICAL SUPPORT HELPLINE Team ot Amiga technical experts at your service
PRICE MATCH We normally match competitors on a 'Same product - Same price'* basis
ESTABLISHED i? YEARS Proven track record in professional computer sales
C13* TURNOVER (with $0 staff' Solid and reliable with maintained growth
BUSINESS EDUCATION GOVERNMENT Volume discounts available tor large orders
SHOWROOMS Demonstration and training facilities at our London A Sidcup branches
THE FULL STOCK RANGE All of your Amiga requirements from one supplier
FREE CATALOGUES Will be mailed to you with offers and software/peripheral details
payment By cash, cheque and all major credit cards
CREDIT PAYMENT TERMS Silica are Itcensed credit brokers - return coupon for details
Beta* you decide when to buy you' nee Amiga computer *• suggest you think very carefully s&out WHERE
you buy *x Consider what rf will be hke a law months after buying your Amiga when you may require additional
peripheral* or totvara or help and advice with you/ new pufchaee And. will the company you buy from coniact
you wfth details of new products? At S*i<a Shop, we ensure that you win have nothing to worry about Sl*ca have
been eetaQlitftati for over i? years, and have an annual turnover of £13 million With our unrivalled experience
and eipertis* we can now ctom to meet our customers requirements with an understanding which <■ second
lonone But don't just taM our word tor * Complete and rstum
the coupon now lor our latest Free literature and begin to ex<
perience the "Sritca Shop Sennce"
MAIL 0R0CR: M The Mews. Hatherley Rd. Sidcup Kent DA14 4DX Tel: 081 309 1111
Ord^L^»Op#r Uk*> S*l vOOameDOpffi No L« Night Openi_ng_ P*-Ho 3fli 30S 0f>*
LONDON SHOP: 52 Tottenham Court Road. London W1P OBA Tel: 071-580 4000
Opsn-nj Hoor» Uon-Stf « 30»™ -SMpTW U tl N.9^1 '-. ^m Ffl, Mo 07' 121 * r 27
SIDCUP SHOP: 14 The Mews. Hatherley Rd, Sidcup. Kent DA14 40X Tel: 081-302 8111
'c*"^ Hows MtvrSaf SOOam^JOpm la* frwflht F nda y uKU Tpra ^a< No OS'Joeoo*'
BUSINESS/HDUCAT10N; 14 The Mevw Hatherley Rd. Sidcup. Kent. DA14 4DX Tel: 081-308 "
OtJ^L.n^Opan Mor»Fr, SOOam^OOpA O ssaO on Slurdsyt *W No OS* JOS OSOfl
po S Sho? d5pTlETS?1 09032. "ThH^wsTatherley RuT5dCu^enTOllTO(
RETURN THE COUPON NOW FOR ^
FREEBROCHURESP
I
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PLEASE SEND INFORMATION ON THE AMIGA
Mr/Mrs/Ma.
lniti|l$: Surname: *
Aooresa: »,♦.**,*..♦♦***. .»»*.* »*.*»»^* "*****■* *•
■tttttai
Iff f m + f ■♦**»* + ■ r , * . . ,
.* * ,.»„*,**•,,..*
■** » h "*
14ft Pla ,.+ .*, t *h - Hb .*.*-P**»,*.* + *
| Postco<Je:
I Which compulef(a), it any, do you own?
lltUttlflll*4P«i *.*•.*
• OHI
A2000
J
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mttcAftng*
r**ur+ lfi« CiXfOO" *3* "*•
Fleetw»y Publications 1989/90
p Virgin Mastertrouic 1990
CBM 64 • DISK £14.99
CBM64 - CASS £9.99
r M
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